(SBI4U1) Light Reactions

Question 1

Step 1

Answer 1

Light(photons) excites electron in photosystem 2(PS2) to the NADP reductase; produces NADPH from NADP+ and H+

Question 2

Step 2

Answer 2

Electron is pulled from photosystem 1(PS1) to photosystem 2(PS2)

Question 3

Step 3

Answer 3

Electrons are produced from photolysis of water, in which oxygen and hydrogen ions are produced

Question 4

Step 4

Answer 4

Hydrogen ions are drawn into the inner thylakoid through the cytochrome

Question 5

Step 5

Answer 5

The chemiosmotic gradient created by the amount of hydrogen ions in the inner thylakoid causes the hydrogen ions to leave via the proton channel protein

Question 6

Step 6

Answer 6

ATP is produced on the ATP synthase, which is then bumped out by the leaving proton

Question 7

Step 7

Answer 7

The leaving hydrogen ions produce NADPH with the electron from photosystem 2(PS2) and NADP+

Question 8

What is the reaction that uses light to split water called?

Answer 8

Photolysis reaction

Question 9

What is the buildup of hydrogen ions in the inner thylakoid known as?

Answer 9

A chemiosmotic gradient

Question 10

Where do light reactions take place?

Answer 10

Thylakoid

Question 11

What is NADP+?

Answer 11

A coenzyme that carries H+

Question 12

Autotrophs vs. Heterotrophs

Answer 12

Autotrophs are “self-feeders”, sustaining themselves without eating anything derived from other living beings
Heterotrophs obtain their organic material by the second major mode of nutrition

Question 13

What pair of chlorophyll a molecules are located in Photosystem II?

Answer 13

P680

Question 14

What pair of chlorophyll a molecules are located in Photosystem I?

Answer 14

P700